C. Window No. 4 and 5 Heat Control Test
(1)
Equipment and Materials
(a) Same as step 1.B.(1)
(2)
Prepare Window No. 4 and 5 Heat Control for Test
(a)
Connect external power supply to airplane.
(b)
Check that the following circuit breakers are closed:
1) On P6-11 panel, WINDOW ANTI-ICE L4 & L5
2) On P6-12 panel, WINDOW ANTI-ICE R4 & R5
(c)
Open the following circuit breakers:
1) On P6-11 panel, WINDOW ANTI-ICE
a) R SIDE
2) On P6-12 panel, WINDOW ANTI-ICE
a) L SIDE
(3)
Test Window No. 4 and 5 Heat Control
(a)
Connect voltmeter to power input terminal of thermal switch on left side No. 5 window to determine when power is applied to window.
(b)
Position left side window control switch to ON, and check that voltmeter indicates 46
+ 12 volts ac.
(c)
Allow windows to continue heating and check that thermal switch on No. 5 left window opens to cut off power within proper time. Cutoff should occur within 15 minutes at 70°F ambient temperature, within 25 minutes at 50°F, and within 40 minutes at 30°F.
(d)
After initial heating, check that thermal switch continues to cycle to maintain window temperatures. Thermal switch P/N 10-1468 opens at 110 + 10°F, and closes at 90 + 10°F. Thermal switch P/N 10-1468-5 opens at 95 + 10°F and closes at 75 + 10°F. Take temperature reading on inside pane of window No. 5 immediately adjacent to thermal switch.
NOTE: Cool ambient conditions may limit temperature of glass and cause some thermal switches to appear to malfunction. An apparently malfunctioning thermal switch shall not be rejected unless a temperature of 125 + 1°F has been attained while conducting above test. Conversely, warm conditions may delay switch closing to 65°F or lower. Temperature of glass need not be measured on closing as long as switch action is produced.
(e)
Return left side window control switch to OFF position and remove voltmeter.
(f)
Repeat steps (a) thru (e) for right side system, using right side window control switch.
(4)
Restore Airplane to Normal
(a)
Close circuit breakers opened in step (2)(c).
(b)
Determine if there is further need for external power, if not; remove external power.
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WINDOW HEAT CONTROL UNIT - REMOVAL/INSTALLATION
1. General
A. This subject contains two tasks, one for the removal and one for the installation of the window heat control unit. The procedure is the same for all window heat control units.
2. Window Heat Control Unit Removal (Fig. 401)
A. References
(1) 20-40-12/201, Electrostatic Discharge Sensitive Devices
B. Procedure
(1)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a)
P6 Panel
1) WINDOW ANTI-ICE L FRONT
2) WINDOW ANTI-ICE R FRONT
3) WINDOW ANTI-ICE L SIDE
4) WINDOW ANTI-ICE R SIDE
(b)
P18 Panel 1) WINDOW HEAT CONTROL LEFT FRONT AC 2) WINDOW HEAT CONTROL LEFT SIDE AC 3) WINDOW HEAT CONTROL RIGHT FRONT AC 4) WINDOW HEAT CONTROL RIGHT SIDE AC 5) WINDOW HEAT CONTROL LEFT FRONT DC 6) WINDOW HEAT CONTROL LEFT SIDE DC 7) WINDOW HEAT CONTROL RIGHT FRONT DC 8) WINDOW HEAT CONTROL RIGHT SIDE DC
(2)
Obey the procedure for electrostatic discharge sensitive devices (Ref 20-40-12/201).
CAUTION: YOU MUST DO THE STEPS IN THE SPECIFIED PROCEDURE WHEN YOU MOVE THE WINDOW HEAT CONTROL UNIT. STATIC DISCHARGE CAN CAUSE DAMAGE TO THE WINDOW HEAT CONTROL UNIT.
(3)
Remove the window heat control unit from the shelf.
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C22036
Window Heat Control Unit Installation 500
30-41-11Page 402 Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Jun 20/93
3. Window Heat Control Unit Installation (Fig. 401)
A. References
(1)
20-40-12/201, Electrostatic Discharge Sensitive Devices
(2)
30-41-11/501, Window Heat Control Unit
B. Procedure
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